Connected: An Internet Encyclopedia
RFC 1583 - A. OSPF data formats

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### A. OSPF data formats

This appendix describes the format of OSPF protocol packets and OSPF link state advertisements. The OSPF protocol runs directly over the IP network layer. Before any data formats are described, the details of the OSPF encapsulation are explained.

Next the OSPF Options field is described. This field describes various capabilities that may or may not be supported by pieces of the OSPF routing domain. The OSPF Options field is contained in OSPF Hello packets, Database Description packets and in OSPF link state advertisements.

OSPF packet formats are detailed in Section A.3. A description of OSPF link state advertisements appears in Section A.4.

A.1 Encapsulation of OSPF packets
A.2 The Options field
A.3 OSPF Packet Formats

A.3.1 The OSPF packet header
A.3.2 The Hello packet
A.3.3 The Database Description packet
A.3.4 The Link State Request packet
A.3.5 The Link State Update packet
A.3.6 The Link State Acknowledgment packet

A.4 Link state advertisement formats

A.4.1 The Link State Advertisement header
A.4.2 Router links advertisements
A.4.3 Network links advertisements
A.4.4 Summary link advertisements
A.4.5 AS external link advertisements

Next: A.1 Encapsulation of OSPF packets

Connected: An Internet Encyclopedia
RFC 1583 - A. OSPF data formats